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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d3bf73299c9eedabc3350f958769372058a28db8d408ea876b9f112bb0f4f3' 
  AND token = '0qIjN5d88+/ASXWbrqWWeS+6R1amAXcG8YGsgPKAmSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}